Rotary sliding vane pump



March 17, 1953 E. A. DAWSON 2,631,546

ROTARY SLIDING VANE PUMP Filed 001;. 19, 1948 3 Sheets-Sheet 1 IN VEN T OR.

zmrdwa mm ATTD R N EYS March 17; 1953 E. A. DAWSON 2,631,546

. ROTARY SLIDING VANE PUMP Filed Oct. 19, 1948 v 3 Sheets-Sheet 2 ll'w.

' ATTDRN EYS March 17, 1953 E. A. DAWSON ROTARY sunmc VANE PUMP 3 Sheets-Sheet 3 Filed Oct. 19, 1948 Patented Mar. 17, 1953 EN T OFFICE ROTARY SLIDING VANE PUMP EdwardA+Dawson, -Greenwich, G'onn. .Applicationnctober 19, 1948', Serial Not 55,317"

6- Glai'ms; (Cl. 103-137 invention. relates to rotary pumps "of" "the type. having a rotor. eccentri'cally positioned in a pump chamber ina. housing with a;v single blade sliding throughthe rotor, and in particular the invention relates to a rotary pump in which the inner peripheral surface of the pump chamher'is designed so that the. distance between the contacting surfaces at the ends'of the bladexremain constant and also :inx'which cushioning-means provided in acavityin the rotor to restrain outward travel of the blade by centrifugalmotion so' that wear caused by the wipcontact of: the ends'of the blade. with "the housing is reducedto a minimum.

The purpose of this invention is toprovide an improved rotary pump having high efficiency with increased suction; and whi'chywillhandle large: volumes at all elevations.

Various types of rotary pumps have been providedand different'methnds" have been used for reduchig the' wear at the'ends'of the blades, but the frictioncausedj by the wipingcontact at the ends of thehlade'scauses'wear on the blades anda'lso on the peripheralsurfaceof the housing; With this thought irr'mind, this invent-ion contemplates'a rotary pump having a rotor with acontinuous blade sliding back and forth there-- through-and with cushioning means in-t-he rotor toreducethe iric'tion'between the ends of the bladesandiinner peripheral surface of the housins: s -'I-'he- 'object' of" this" inventionis; therefore, to provide -means for-mounting a blade in a rotorof a rotarypumpso-thatwea-r caused by the wip ing contact of the ends ofthe blade with the housing is reduced to a minimumand so that a point of contact betweenthe rotor and the housing is formed; with a rollingaotion.

Another object ofthe invention is toprovide means for permitting'the escape of foreign matter between the rotor of a rotary pump and a housing.

Another object of theinventionis to provide means. for shaping the innerperipheral surface of theflpump chamber of a rotary pump; so that the contacting" length ofsa blade the rotor re mains-constant v A further object of the invention is 'toprovide an improved rotary pump which is-of= a simple and economical construction.

with these-and other objects in view; the inventi'on consists ofthe new and useful combina.

tion construction, and arrangement or parts as. hereinafter more fully described, set forth in the c1aim5 appended.heret0,..and disclosed i'nthe ac- 2. companying drawing forming part hereof. wherein:

Figure I'is a view showing a side elevation ofe pu p;

Figure 2 is a longitudinal section through the pump illustrating the construction thereof andtaken on line 22 of Figure 1;

Figure 3 is a view similar-to that shown in- Figure l with the cover plate removed;

Figure 4'. is a cross section through the pump taken on line 4--4 ofxFigure' 2;

Figure 5 is a view similar to-th'at shownin-Figure 4 looking in the opposite direction and with the: rotor and other moving parts removed;

Figure 6 is a detailshowing an and elevation of the rotor;

Figure 7 is a; detail showing a side elevationof the rotor with parts broken away and parts shown in. section;

Figure 8 is a view showing the blade;

Figure 9 is-a detail showing a removable flange forming one end ofthe rotor; and- Figure I-Ois a sectional view showing-thebear-- ing mounting of the roller which provides roll-- ing contact between the rotor and housing.

Referring now to the drawings wherein like reference characters denote-corresponding parts,

theimproved rotary pump of this invention iii-- cludesa rotor Hl having a removable head H, a blade l2 and a housing l-3 having a cover plate Hi.

The rotor HI is formed as illustrated in Fig ures 6" and 7- with an annular recess. I 5- to receive the head I I, an intermediate cavity Hi witha-lignedslots IT and Ill extended through thewalisthereof, and with a hub l-9 extended from the closed end providing j-ournal'ingmeans of the rotor in the housing. The rotor isalso provided with a shaft 2 3 thatextend's -from the hub l-sand pin receiving -openings zI and Here pro-- vided in lugs 23' and 2'4, respectively, in the opp'osite end. The head His provided with a:- pin 25 that registers with the opening 22- and a pin 26 that registers with the opening 2-1, and the head: is also provided with a shaft 21- thatiis aligned with the shaft 28 oftherotor.

Theblade l-2- is designed to slide freely in the slots I1 and [8 across the rotor and the ends are provided with continuous slots 28 and 29 inwhich contact plates 30' and 3+ are positioned andthe plates are resiliently'held outward by springs and 33. An opening 34 is provided in the'center' of the blade in which spring holdingposts' tit-and 36 are-heldbya boit' $1 withanut38 'Iheposts are provided with recesses 39' and 40* respec tively which hold the springs 4| and 42 the opposite ends of which bear against the inner surfaces of the lugs 23 and 24 of the rotor. With the position of the blade neutralized by the springs the blade will be prevented from being thrown outwardly against the inner peripheral surface 43 of the housing, thereby preventing excessive wear on the plates 30 and 3|.

The inner peripheral surface 43 of the housing is formed by radii the centers of which are dropped downwardly slightly from a point midway between the upper and lower surfaces thereof which is indicated by the numeral 44 and then moved horizontally with the side at the left of the housing illustrated in Figure 3 formed on a radius from the point 45 and the side at the right formed on a radius from the point 46. The upper and lower ends of the arcs are joined by arcs the radii of which are taken from the point 44.

In the lower part of the housing and on the center thereof is a cylindrical opening 41 in which a roller 48 is mounted and the roller is provided with extended pins 49 and 50 at the ends which are rotatably mounted in bearing blocks and 52 by ball bearings 53 and 54. The ends of the roller are resiliently held upward by springs 55 and 56 whereby the upper surface of the roller is held in yielding contact with the rotor and should sand or grit be drawn into the pump, the roller 48 will move downwardly to permit passage thereof.

The pump housing i3 is provided with a cylindrical pump chamber 51, and at one side of the chamber is an annular reces 58 to receive the end of the rotor and another similar recess 59 to receive the hub l9 of the rotor. The housing is provided with an extended hub 60 having a packing gland 5| and a roller bearing 62 therein, and a packing nut 63, is provided at the inner side of the bearing. The outer end of the hub is provided with a cover plate 64 which is held by screws 65. The intermediate part of the housing is provided with inlet and discharge connections 66 and 61 which communicate with the pump chamber 51 and it will be understood that the positions of these connections may be reversed as the pump may either be run in a clockwise or counter-clockwise direction.

The cover plate I4 is mounted on the opposite end of the housing by studs 68 with nuts 69 and this plate is provided with an annular recess 10 to receive this end of the rotor, The cover plate is also provided with a hub H having a packing gland 12, a nut 13 and a bearing 14 therein, and the outer end of this hub is provided with a cover plate that is held by bolts It.

With the part arranged in this manner the rotor may be driven from either end and as the rotor rotates the blade slides back and forth therein with the plates 30 and 3| in constant wiping contact with the inner peripheral surface 43 of the housing and, as hereinbefore stated, the outward force of the blade is neutralized by the cushioning springs in the center of the rotor whereby the wear on the plates in the ends of the blade is reduced to a minimum.

It will be understood that modifications may be made in the design and arrangement of the part without departing from the spirit of the invention.

What is claimed is:

1. A rotary pump comprising a. housing having a substantially cylindrical pump chamber therein, a rotor having a transversely disposed blade holding slot therethrough rotatably mounted in the housing and eccentrically positioned in said pump chamber, said rotor having a cavity therein, a blade slidably mounted in the slot of the rotor with both ends thereof extended from the peripheral surface of the rotor and in continuous contact with the inner surface of the cylindrical pump chamber, studs extended from opposite sides of the blade, springs, the axes of which are parallel to the blade spaced from the sides of the blade and positioned between the studs and opposite sides of the inner surface of the rotor for restraining outward travel of the blade, and inlet and discharge connections in the housing communicating with said pump chamber.

2. A rotary pump comprising a housing having a substantially cylindrical pump chamber therein, a rotor having a transversely disposed blade holding slot therethrough rotatably mounted in the housing andeccentrically positioned in the pump chamber, a blade slidably mounted in the slot of the rotor with both end thereof extended from the peripheral surface of the rotor and in continuous contact with the inner surface of the'.

cylindrical pump chamber, plates resiliently mounted in the ends of the blade providing contact means with the inner peripheral surface of the pump chamber, studs extended from opposite sides of the blade, springs, the axes of which are parallel to the blade spaced from the sides ofv the blade and positioned between the studs and opposite sides of the inner surface of the rotor for equalizing the position of the blade, and inlet and discharge connections in the housing communicating with the pump chamber.

3. A rotary'pump comprising a housing having a substantially cylindrical pump chamber. therein, a rotor having aligned shafts extending from both ends and having a transversely disposed blade holding slot therethrough, said rotor having a cavity therein and being rotatably mounted in the housing with one point of the surface thereof contacting the inner peripheral surface of the pump chamber, a blade slidably mounted in the slot in the rotor with both ends thereof in continuous engagement with the inner peripheral surface of the pump chamber, studs extended from opposite sides of the blade, springs, the axesof which are parallel to the blade spacedfrom: the sides of the blade and positioned between the studs and opposite sides of the inner surface of the rotor for equalizing the position of the blade in the rotor, and inlet and discharge connections in the housing communicating with said pump chamber.

4. A rotary pump comprising a housing having a substantially cylindrical pump chamber therein, a rotor having a transversely disposed slot therethrough rotatably mounted in th housing and eccentrically positioned in the pump chamber, a blade slidably mounted in the slot of the rotor with both ends thereof in continuous wiping contact with the inner peripheral surface of the pump chamber, studs extended from opposite sides of the blade, springs, the axes of which are parallel to the blade spaced from the sides of the blade and positioned between the studs and opposite sides of the inner surface of the rotor, a roller rotatably mounted in the housing contacting the rotor, resilient means in the housing positioned at both ends of the roller for urging the roller against the surface of the rotor, and inlet and discharge connections on opposite sides of the rotor.

5. A rotary pump comprising a housing having 7 a substantially cylindrical pump chamber therein, a roto having a transversely disposed blade holding slot therethrough rotatably mounted in the housing and eccentrically positioned in the said pump chamber, a blade slidably mounted in the slot of the rotor with both ends thereof in continuous wiping contact with the inner peripheral surface of the pump chamber, said rotor having a cavity therein, studs extended from opposite sides of the blade, springs, the axes of which are parallel to side surfaces of the blade positioned in the cavity of the rotor and connected to the studs on the blade and bearing against the opposite sides of the inner surface of the rotor for providing cushioning means equalizing the travel of the blade in the rotor and restraining outward movement of the said blade in relation to the rotor, and inlet and discharge connections in the housing communicating with the said pump chamber.

6. In a rotary pump, the combination which comprises a housing having a cylindrical pump chamber therein,,a rotor having a transversely disposed blade holding slot therethrough journaled in the housing and eccentrically positioned in the said pump chamber, said housing having inlet and outlet connections and said rotor positioned to engage the inner peripheral surface of a cylindrical pump chamber between the said inlet and outlet connections, a blade extended continuously through the rotor slidably mounted in the slot thereof and positioned with both ends in continuous wiping contact with the inner peripheral surface of the pump chamber, said rotor having a cavity in the intermediate part thereof, a stud carried by the blade positioned intermediate of the ends thereof and with the ends of the stud extended from both sides of the blade, cushioning springs carried by the extended ends of the stud and positioned to engage walls on the opposite sides of a cavity of the rotor, said springs urging the blade to a neutral position in the rotor with the ends extended equally at both sides of the rotor, and resiliently actuated means for sealing the point of contact between the surface of the rotor and the inner peripheral surface of the cylindrical pump chamber between the said inlet and outlet connections.

EDWARD A. DAWSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 399,822 Blades Mar. 19, 1889 1,196,977 Piatt Sept. 5, 1916 1,344,085 Horman June 22, 1920 1,558,696 Mari-on Oct. 27, 1925 1,626,510 Chase Apr. 26, 1927 2,351,817 Johnson June 20, 1944 2,359,903 Fanning Oct. 10, 1944 FOREIGN PATENTS Number Country Date 14,848 Great Britain 1912 51,900 Switzerland Nov. 29, 1919 568,184 Germany Jan. 20, 1933 

